I have been looking around for open source web based groupware projects for a while now, I am looking for some help finding the right one for me...

I have been using Yahoo's advertising based service which is great and allows one user to subscribe to many groups which is pretty much the way I want things to work. all the other stuff onthe site is good except for one thing... I would love there to be a wiki component too. I think this would make all the difference and turn it into a work tool which is what i want.

So any ideas of any projects very similar to Yahoo's groups but including a wiki component or at least projects close to this but needing a wiki added?

I have been looking and found a lot of projects but noe that allow one user logn access to many groups which is the way I want it to work.

Thanks, I never got to Ice Walker seems ot have lots of links. PHPgroupeware looks good. I got Egroupware (which is a fork of this I think) to work but it does not quite have the groups capability that I wanted... I will keep looking, so thanks for the help!